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-- SPDX-License-Identifier: MIT
--
-- An example plugin to make the pointer go three times as slow
--
-- Install this file in /etc/libinput/plugins and
--
-- UNCOMMENT THIS LINE TO ACTIVATE THE PLUGIN
-- libinput:register({1})
remainders = {}
function split(v)
if math.abs(v) >= 1.0 then
local i = math.floor(math.abs(v))
local r = math.abs(v) % 1.0
if v < 0.0 then
i = -i
r = -r
end
return i, r
else
return 0, v
end
end
function decelerate(device, x, y)
local remainder = remainders[device]
local rx, ry = 0, 0
if x ~= 0.0 then
rx, remainder.x = split(remainder.x + x/3.0)
end
if y ~= 0.0 then
ry, remainder.y = split(remainder.y + y/3.0)
end
return rx, ry
end
libinput:connect("new-evdev-device", function(device)
local usages = device:usages()
if usages[evdev.REL_X] then
remainders[device] = { x = 0.0, y = 0.0 }
device:connect("evdev-frame", function(device, frame, timestamp)
for _, v in ipairs(frame) do
if v.usage == evdev.REL_X then
v.value, _ = decelerate(device, v.value, 0.0)
elseif v.usage == evdev.REL_Y then
_, v.value = decelerate(device, 0.0, v.value)
end
end
return frame
end)
device:connect("device-removed", function(dev)
remainders[dev] = nil
end)
end
end)
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